Be advised that you can go to the Pavillions as early as 0700 and see plenty of cars. Should be a full lot by 0930. Two years ago I showed at 0645 and almost missed a spot in the main parking area. A terrific opportunity not only for quantity muscle, but some unique gems too.
Also, don't forget Russo and Steele Auction, a tad further north of BJs off of the 101 at the Scottsdale Rd exit (you can see their tents from the 101 just to the south). They are expanding to 5 days (from 4) and have a higher percentage of muscle cars than BJ (my opinion)